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(ModeL) R. H. DORN.

LOOK HINGE.

Patented Apr. 26, 1887.

UNITED STATESPAT NT OFFICE.

RUFUS H. DORN, OF ROCHESTER, NEW YORK.

LOCK-HINGE.

SPECIFICATION forming part of Letters Patent No. 361,681, dated April26, 1887.

(Modch) To all whom it may concern:

Be it known that I, RUFUs H. DORN, a citizen of the United States,residing at Rochester, in the county of Monroe and State of New York,have invented certain new and useful Improvements in Lock-Hinges, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

The object of my invention is to provide a blind-hinge of simpleconstruction which is adapted, when the blind is opened and thrown back,to be securely held in such position by a locking device which, byvirtue of the impetus given to the blind as the latter is thrown back,is positively forced into locking position.

My locking blind hinge consists of two leaves, one of which is to beattached to the window-frame and the other to the blind, one of the saidleaves having'a pintle fitting loosely in a socket in the otherin theusual manner. That oneof the said leaves-preferably thesocket-leaf-which is to be secured to the window-frame is provided witha lug or projection adapted to be engaged by a weighted lever pivot-allyattached to the other leaf, which latter is to be fastened to and thusmovable with the blind. The said lever is provided with a notch adaptedto engage the lug on the leaf attached to the window-frame, and theinblind back.

back. Figs. 3 and 4 are detail views of the socket and pintle leaves,respectively.

A denotes a portion of the window-frame, and B one of the leaves of thehinge (in this instance the socket-leaf) secured thereto, said leafbeing provided with a holding-lug. b.

O is the pintle-leaf of the hinge attached to the blind D, said leafhaving an aperture, 0, through which passes the locking-lever E, havinga weighted end, 6, provided with a notch, e, the inner wall of which ison a lug, e projecting downward below the pivotal point of the lever,said point in the present instance being at the upper wall of a notch,e, which is tlared slightly to enable the said lever to be placed inoperative position and to vibrate on the pintle-leaf, to which itremains attached when the pintle-leaf is secured to the blind, as shownin Fig. 2 of the drawlugs. 1

When the parts are assembled as shown in the drawings, and the blind isthrown back to the position shown in Fig. 2 and in dotted lines in Fig.l, the rounded lower face of the weighted end of the lever will strikethe holding-lug b on the socket-leaf, thus raising said end to theposition indicated by dotted lines in Fig. 2, and as the notch 6 comesfully over the said lug the lug e on the lever E will come into forciblecontact with the lug b. As the lug e is below the pivotal point of saidlever E, the weighted end of the latter will be positively forceddownward by the impetus of the contact between the lugs b and 6 therebybringing the lever to the position indicated by full lines in Fig. 2,with the lug I) fully engaged by the notch e of the lever, and when theparts are in this position the blind will be securely looked back andthe Weighted end of the le ver will prevent any accidental disengagementof the latter from its holding-lug b.

The lever E projects through the blind D, so that it is convenientlyaccessible to be operated to release the blind when the latter is to beclosed. 7

Having thus described my invention, I claim and desire to secure byLetters Patent- 1. The combination, with the two leaves of a hinge, oneof which is provided with a holding-lug, I), of the locking-lever E,pivotally attached near its center to the other of said and the weightedlever E, movable with the leaves, and having the Weighted end 6, pro- Ileaf 0, and having the lug 0" below its pivotal vided with the notch e,and the striking-lug point, and the notches e and 6 the latter be- 15 eat the rear or inner side of said notch, the ing flaring to admit of thevibration of said 5 latter and the said striking-lug being'both belever,substantially as set forth.

low the pivotal point of the said lever, so that In testimony whereof Iaffix my signature in the latter will be positively forced into engagepresence of two witnesses. ment with the said holding-lug when theblind is suddenly thrown back, substantially as set RUFUS DORN' r0forth. WVitnesses:

2. The combination, with the socket-leaf B, JOHN M. DUNNING, having theholding-lug b, of the pintle-leaf O, A. SLOOUM.

